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Date: Tue, 12 Dec 2017 07:56:44 -0800
From: Andy Lutomirski <luto@...nel.org>
To: x86@...nel.org
Cc: linux-kernel@...r.kernel.org, Borislav Petkov <bp@...en8.de>,
Brian Gerst <brgerst@...il.com>,
David Laight <David.Laight@...lab.com>,
Kees Cook <keescook@...omium.org>,
Peter Zijlstra <peterz@...radead.org>,
Andy Lutomirski <luto@...nel.org>,
"Kirill A. Shutemov" <kirill@...temov.name>,
Dave Hansen <dave.hansen@...el.com>
Subject: [PATCH PTI v3 09/10] x86/mm/64: Make a full PGD-entry size hole in the memory map
This patch shrinks vmalloc space from 16384TiB to 12800TiB to
enlarge the hole starting at 0xff90000000000000 to be a full PGD
entry.
A subsequent patch will use this hole for the pagetable isolation
LDT alias.
Cc: "Kirill A. Shutemov" <kirill@...temov.name>
Cc: Dave Hansen <dave.hansen@...el.com>
Signed-off-by: Andy Lutomirski <luto@...nel.org>
---
Documentation/x86/x86_64/mm.txt | 4 ++--
arch/x86/include/asm/pgtable_64_types.h | 4 ++--
2 files changed, 4 insertions(+), 4 deletions(-)
diff --git a/Documentation/x86/x86_64/mm.txt b/Documentation/x86/x86_64/mm.txt
index 63a41671d25b..6a28aeaccd53 100644
--- a/Documentation/x86/x86_64/mm.txt
+++ b/Documentation/x86/x86_64/mm.txt
@@ -28,8 +28,8 @@ Virtual memory map with 5 level page tables:
hole caused by [56:63] sign extension
ff00000000000000 - ff0fffffffffffff (=52 bits) guard hole, reserved for hypervisor
ff10000000000000 - ff8fffffffffffff (=55 bits) direct mapping of all phys. memory
-ff90000000000000 - ff91ffffffffffff (=49 bits) hole
-ff92000000000000 - ffd1ffffffffffff (=54 bits) vmalloc/ioremap space
+ff90000000000000 - ff9fffffffffffff (=52 bits) hole
+ffa0000000000000 - ffd1ffffffffffff (=54 bits) vmalloc/ioremap space
ffd2000000000000 - ffd3ffffffffffff (=49 bits) hole
ffd4000000000000 - ffd5ffffffffffff (=49 bits) virtual memory map (512TB)
... unused hole ...
diff --git a/arch/x86/include/asm/pgtable_64_types.h b/arch/x86/include/asm/pgtable_64_types.h
index 6d5f45dcd4a1..6e2f50843c7d 100644
--- a/arch/x86/include/asm/pgtable_64_types.h
+++ b/arch/x86/include/asm/pgtable_64_types.h
@@ -78,8 +78,8 @@ typedef struct { pteval_t pte; } pte_t;
/* See Documentation/x86/x86_64/mm.txt for a description of the memory map. */
#define MAXMEM _AC(__AC(1, UL) << MAX_PHYSMEM_BITS, UL)
#ifdef CONFIG_X86_5LEVEL
-#define VMALLOC_SIZE_TB _AC(16384, UL)
-#define __VMALLOC_BASE _AC(0xff92000000000000, UL)
+#define VMALLOC_SIZE_TB _AC(12800, UL)
+#define __VMALLOC_BASE _AC(0xffa0000000000000, UL)
#define __VMEMMAP_BASE _AC(0xffd4000000000000, UL)
#else
#define VMALLOC_SIZE_TB _AC(32, UL)
--
2.13.6
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